2021 Suburban no rear heat

[Jgreen84]

Have a 2021 Suburban LT the rear climate control is blowing ice cold with controls set to high heat and when synced with the front controls. Anyone else with this issue ?

 

[Chad G 1979]

I have not heard of this issue before in the forum here. Not sure if this might work, but try turning the temp in the rear, all the way to low and let it run for a little bit (30 seconds), then turn the heat all the way to high again. Maybe there is something stuck and that may free up whatever is causing it to blow cold air instead of hot air. Dont know if that would work but worth a shot.

 

[StephenPT]

Double check that you are getting coolant flow back there. With the engine up to temp, feel the two rubber hoses going into the aux heater core. It’s underneath on the rear passenger side. You’ll also see the two AC lines for the aux evaporator.

If that’s good, then look into the blend door actuator - could be stuck and not allowing air to flow across the heater core.

 

[Jgreen84]

Tried that with no luck

 

[Jgreen84]

Double check that you are getting coolant flow back there. With the engine up to temp, feel the two rubber hoses going into the aux heater core. It’s underneath on the rear passenger side. You’ll also see the two AC lines for the aux evaporator.

If that’s good, then look into the blend door actuator - could be stuck and not allowing air to flow across the heater core.

I will check that tomorrow!

 

[Burbs]

Did you figure this out? I have the exact same thing going on with no rear heat in my 2021 Chevy Suburban Premier.